Used by idainfo::s_prefflag. 
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#define  | PREF_SEGADR   0x01 | 
|   | show segment addresses? 
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#define  | PREF_FNCOFF   0x02 | 
|   | show function offsets? 
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#define  | PREF_STACK   0x04 | 
|   | show stack pointer? 
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#define  | PREF_PFXTRUNC   0x08 | 
|   | truncate instruction bytes if they would need more than 1 line 
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